CNN CNN Newsroom August 5, 2013 18:09:00
Originate? >> reporter: well, brooke, it seems that the threat originates in yemen. there's a lot of concern because it may be linked to the chief bombmaker of the group in yemen, ibrahim asyria. he's the mastermind behind those three attempts against u.s. airliners. three plots against u.s. airliners in recent years. he's been able to build the most sophisticated devices ever seen from al qaeda devices which are very difficult for detection, scanner equipment to pick up. so a lot of concern that he may be linked to this plot. this is a guy who put a bomb inside his own brother in august 2009 ...